| $(a)$ $6-15$ pairs of gill slits | $(i)$ $Trygon$ |
| $(b)$ Heterocercal caudal fin | $(ii)$ $Petromyzon$ |
| $(c)$ Air bladder | $(iii)$ $Chondrichthyes$ |
| $(d)$ Poison sting | $(iv)$ $Osteichthyes$ |
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| $(1)$ Diploblastic | $(a)$ Protozoa to Echinodermata |
| $(2)$ Coelomate | $(b)$ Platyhelminthes to Chordata |
| $(3)$ Triploblastic | $(c)$ Coelenterata |
| $(4)$ Invertebrates | $(d)$ Annelida to Chordata |
| $A$. Polychaeta | $p$. Scorpion |
| $B$. Trematoda | $q$. Pila |
| $C$. Arachnida | $r$. Liver Fluke |
| $D$. Gastropoda | $s$. Nereis |
| $t$. Star Fish |
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